<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>模板茶汁</title>
</head>
<body>
<div id="app">
    <h1>{{ message }}</h1>
    <h1 id="headLeve1">{{ message }}</h1>
</div>

</body>
<script>
    let element = document.getElementById("headLeve1")
    let message = "hello world"

    element.innerHTML = message
</script>
</html>